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RESERVE ROLLFORWARDS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance | $ 453 |  | $ 487 | [1] |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |  |  |
Beginning Balance | 1,177 |  | 1,063 |  | $ 919
Charges (Credits) to Cost and Expense | (100) |  | 132 |  | 163
Charged to Other Accounts | (14) |  | 1 |  | 11
Deductions | 16 |  | 19 |  | 30
Ending Balance | 1,047 |  | 1,177 |  | 1,063
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |  |  |
Beginning Balance | 11 |  | 12 |  | 10
Charges (Credits) to Cost and Expense | 0 |  | 0 |  | 3
Charged to Other Accounts | 0 |  | 0 |  | 0
Deductions | 0 |  | 1 |  | 1
Ending Balance | 11 |  | 11 |  | 12
LIFO Inventory [Member] |  |  |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |  |  |
Beginning Balance | 337 |  | 288 |  | 264
Charges (Credits) to Cost and Expense | (89) |  | 44 |  | 24
Charged to Other Accounts | 0 |  | 5 |  | 0
Deductions | 0 |  | 0 |  | 0
Ending Balance | 248 |  | 337 |  | 288
Non-environmental asset retirement obligation Costs [Member] |  |  |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |  |  |
Beginning Balance | 46 |  | 49 |  | 46
Charges (Credits) to Cost and Expense | 2 |  | (2) |  | 2
Charged to Other Accounts | 0 |  | 0 |  | 1
Deductions | 0 |  | 1 |  | 0
Ending Balance | 48 |  | 46 |  | 49
Environmental Contingencies [Member] |  |  |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |  |  |
Beginning Balance | 296 |  | 304 |  | 321
Charges (Credits) to Cost and Expense | 7 |  | 9 |  | 8
Charged to Other Accounts | 0 |  | 0 |  | 4
Deductions | 16 |  | 17 |  | 29
Ending Balance | 287 |  | 296 |  | 304
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |  |  |
Movement In Valuation Allowances And Reserves Roll Forward |  |  |  |  |
Beginning Balance | 487 | [2] | 410 |  | 278
Charges (Credits) to Cost and Expense | (20) |  | 81 | [2] | 126
Charged to Other Accounts | (14) |  | (4) | [2] | 6
Deductions | 0 |  | 0 | [2] | 0
Ending Balance | $ 453 |  | 487 | [2] | $ 410
Previously Reported [Member] |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  |  | $ 466 |  |
[1] | Revised from Note 7, "Income Taxes", to the Company's 2018 Annual Report on Form 10-K, which reported net operating loss carryforwards as $708 million, valuation allowance as $466 million, and investments as $(274) million.
[2] | Revised from Note 21, "Reserve Rollforwards", to the Company's 2018 Annual Report on Form 10-K, which reported deferred tax valuation allowance as $466 million.

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